Hydrocal M4 Heat Meters

HYDROCAL-M4 — a turbine-type apartment heat meter with remote reading.

The HYDROCAL-M4 is a compact apartment heat meter by B METERS (Italy) that measures energy for heating and/or cooling in centrally supplied systems. Inductive sensing of the turbine eliminates the influence of external magnets, while the wM-Bus or LoRaWAN variants enable reliable remote reading in fixed networks and “walk-by”. When wired integration into reading systems is required, the IR-MB-Pulse module is added, providing an M-Bus output and pulse inputs.

Key features

• Mechanical turbine heat meter with inductive rotation sensing — resistant to magnetic tampering and highly durable.
• Combined for heating and cooling (heat/cool), approved to EN 1434 and MID 2014/32/EU MI-004.
• Remote reading: built-in wM-Bus or LoRa/LoRaWAN options; wired M-Bus available via the IR-MB-Pulse module.
• Up to 2 pulse inputs (via external module) for external water/energy meters; M-Bus output to EN 13757-2/3.
• Computing unit rotatable 360° for easy installation and readability in tight recesses.
• OMS v4 compatibility (with wM-Bus).
• Battery life up to 10 years.

The device supports configuration from the buttons or via NFC (Android), features an 8-digit LCD display with icons and a rich information menu, including monthly/fortnightly and annual histories.

Communication and remote reading

• Built-in options: Wireless M-Bus or LoRa/LoRaWAN.
• Wired M-Bus: via the IR-MB-Pulse module (M-Bus EN 13757-2/3) + 2 pulse inputs for external meters.
• OMS v4 compatibility (wM-Bus).

Dimensions and flow rates (compact versions)

• DN15 (G 3/4″), L 110 mm: qp 0.6 m³/h or qp 1.5 m³/h
• DN20 (G 1″), L 130 mm: qp 2.5 m³/h
• qmax: 1.2 / 3.0 / 5.0 m³/h | qmin: 12 / 30 / 50 L/h
• Accuracy class: 2 | R ratio (qp/qi): 50 | PN: 16 bar | Δp at qp: ≤ 0.25 bar

Temperatures

• Heating (θ): 1…90 °C | ΔT: 3…90 K
• Cooling (θ): 0.2…90 °C (calibration 0.2…90 °C)

Power supply and display

• Lithium battery with a life of up to 10 years (depending on transmission configuration and environment).
• LCD 8 digits + icons, 9 display levels; the computing unit rotates 360°.
• Protection rating: IP65 (follow the installation instructions to maintain the IP rating).

Functions and logs

• History: monthly/fortnightly and annual archives; daily/hourly average values (depending on the menu).
• Configuration: from the buttons or via NFC (Android app).

Approvals and standards

• EN 1434, MID 2014/32/EU MI-004.

For apartments, qp 0.6 / 1.5 / 2.5 m³/h are most commonly used, depending on the design flow rates and pressure drop. The choice of communication (wM-Bus, LoRaWAN or M-Bus) depends on the available infrastructure and reading frequency.

Contact Dalsia for sizing and configuration to suit your site.